Transformations Reflections, and Rotations

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1 Grade level: 9-12 Subject: mathematics Time required: 30 minutes Transformations Reflections, and Rotations by Lynne B. Uebelhoer Activity overview This activity is designed to be used in a middle-school r high-school geometry classroom. An understanding of labeling points in the coordinate plane is necessary. Concepts This is an exploration of the specific transformations: reflections and rotations. Teacher preparation A review of the coordinate plane, quadrants, and labeling points is helpful for labeling the points as well as describing the transformations. To encourage student to describe the transformations observed concrete examples should be introduced. Using a chair with wheels, push the chair away. Ask the students to describe the change which occurred. Ask students what occurs when they look in the mirror each morning. Encourage students to develop descriptions using such terms as flip, turn, and slide. Classroom management tips This activity is student-centered with the teacher role as that of facilitator. Small groups will encourage discussion regarding observations. TI-Nspire Applications TI-Nspire, Graphs & Geometry, Notes Have students open the program file and read page 1.1 Students are directed to draw a polygon on the grid provided on page 1.2. A possible choice is provided here as an example. Once the polygon is drawn the students are asked to label the vertices and record both the label and coordinates on their worksheet. On page 1.4 directions are given for the first transformation. A possible choice is provided here as an example. Once the polygon is drawn the students are asked to label the vertices and record both the label and coordinates on their worksheet. Transformations: Reflections and Rotations 2008 Texas Instruments Incorporated by Lynne B. Uebelhoer Page 1

2 Activity Title Goes Here by: author name goes here Subject: mathematics Time required: 30 minutes Page 1.6 provides students an opportunity to reflect on their observations. Page 1.7 and 1.9 instruct the student to continue reflecting throughout the coordinate plane. With a final stop in Quadrant IV. Page 1.13 Guides student s towards a understanding of terminology presented within the activity. Assessment and evaluation The handout may be collected and evaluated to determine the understanding of concepts presented in this activity. Activity extension A discussion exploring the relationship between a series of reflections and rotation can illustrate the relationship between these two transformations Texas Instruments Incorporated Page 2

3 2008 Texas Instruments Incorporated Page 3

4 In this activity through a series of transformations you will: Find the outcome of reflections across the x- and y- axis. Determine how a rotation may occur through reflections Open the file Transformations: Reflections and Rotations. On page #2 you will find a coordinate grid. Under shapes choose polygon. Draw a polygon with at least three vertices. Label each of the vertices and give the coordinates. Space is provided for up to 6 vertices. Record the vertices as well as the label: A) Follow the directions within the program for moving your polygon across the y-axis. In which vertices use the same letters for the corresponding points adding a to each label.(i.e. A becomes A ) B) Follow the directions within the program for moving your polygon across the x-axis. In which 2008 Texas Instruments Incorporated Page 4

5 vertices use the same letters for the corresponding points adding a to each label.(i.e. A becomes A ) C) Follow the directions within the program for moving your polygon across the y-axis. In which vertices use the same letters for the corresponding points adding a to each label.(i.e. A becomes A ) D) What would occur if you were to complete one more transformation of your polygon? E) 2008 Texas Instruments Incorporated Page 5

TImath.com. Geometry. Reflections and Rotations. Time required 45 minutes ID: 8286

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